how to address P0302 misfire code in Toyota Corolla E170 (2013-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil from cylinder 2.
• Remove the spark plug using the socket set.
• Inspect the spark plug for wear or damage; replace if necessary.
• Check and adjust the spark plug gap according to manufacturer specifications (typically around 0.043 inches).
• Install the new or inspected spark plug and torque to manufacturer specifications (usually about 13 ft-lbs).

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set.
• Disconnect the electrical connector from the ignition coil of cylinder 2.
• Use a multimeter to check the primary and secondary resistance of the ignition coil; compare values to specifications.
• Replace the ignition coil if it is out of specification.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, basic hand tools.
• Disconnect the fuel line and electrical connector from the cylinder 2 fuel injector.
• Remove the fuel injector from its rail.
• Clean the injector using a fuel injector cleaner or replace it if clogged or damaged.
• Reinstall the fuel injector and reconnect the fuel line and electrical connector.

5. Perform a Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 2.
• Insert the compression gauge and crank the engine to measure the compression.
• Compare the compression values against specifications; if low, further engine diagnostics may be necessary.